In Murray River & Murray Harbour
It's nice to be able to camp within sight of a white-sand beach, and you can do just that in Panmure Island Provincial Park (tel. 902/838-0668). There are 43 sites here, some with hookups, some nicely sited in grassy fields with water views. Cost is from C$23 to C$27 per night. They accept credit cards. The campground, like the park, is open from early June through the middle of September.
In addition to the park's own resort, Brudenell River Provincial Park (tel. 902/652-8966) also maintains a large campground of 95 sites with various levels of services and amenities. Rates range from C$23 to C$30 per night. The park is open from mid-May through early October.
In Souris & Northeast Prince Edward Island
There's also camping at Red Point Provincial Park (tel. 902/357-3075). There are about 120 sites here, costing from C$23 to C$30, most of them built to handle the annual summer influx of RVs. They take reservations beginning in April, and accept credit cards; there are kids' programs throughout July and August.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.